APROPOS

Ap″ro‐pos′ (ăp″rō̍‐pō′), a. & adv. [[F. à propos; à (L. ad) + propos purpose, L. proposium plan, purpose, fr. proponere to propose. See Propound.]] 1. 1. Opportunely or opportune; seasonably or seasonable.
A tale extremely apropos. Pope. 2. 2. By the way; to the purpose; relevant; suitably to the place or subject; — a word used to introduce an incidental observation, suited to the occasion, though not strictly belonging to the narration.